[PATCH 3/5] audit: add netlink audit protocol bind to check capabilities on multicast join

[Richard Guy Briggs]

Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.

Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
 kernel/audit.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index b5b2f72..f2d2d61 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1050,10 +1050,20 @@ static void audit_receive(struct sk_buff  *skb)
 	mutex_unlock(&audit_cmd_mutex);
 }
 
+/* Run custom bind function on netlink socket group connect or bind requests. */
+static int audit_bind(int group)
+{
+	if (!capable(CAP_AUDIT_READ))
+		return -EPERM;
+
+	return 0;
+}
+
 static int __net_init audit_net_init(struct net *net)
 {
 	struct netlink_kernel_cfg cfg = {
 		.input	= audit_receive,
+		.bind	= audit_bind,
 	};
 
 	struct audit_net *aunet = net_generic(net, audit_net_id);
-- 
1.7.1

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